Mithra is the antagonist of Moonlight Syndrome and by extension the Twilight Syndrome games as well, causing the titular syndromes. Although he appears as a young child, Mithra is very violent, manipulative and cruel, killing Yukari Hasegawa, Arisa Kahara, Chisato Itsushima and Mika Kishi. He is killed by Ryo Kazan, who wields a katana to tear him apart in the conclusion of the story, apparently bringing an end to the syndrome.

Mithra also appears in a single scene in killer7 in the Alter Ego chapter, referred to as "The Oracle" in Hand in killer7. His reason for being there is unknown, though it may be connected to the full moon appearing at the beginning of each mission. As The Oracle, he appears as twins who have the voice of an old man.

Mithra is the Zoroastrian god of contract, a real figure in Zoroastrian mythology. However, in Zoroastrianism Mithra is an exalted and benevolent figure, while in Moonlight Syndrome he is a ruthless villain and in killer7 he is mysterious and represents duality.

killer7 characters
The killer7 Harman Smith · Garcian Smith · Dan Smith · KAEDE Smith · Kevin Smith · Coyote Smith · Con Smith · MASK de Smith
The Smith Syndicate Samantha Sitbon · Christopher Mills · Iwazaru · Kikazaru · Mizaru · Travis Bell · Kess BloodySunday · Yoon-Hyun · Susie Sumner · Mad Doctor · Gary Wanderers
Heaven Smile Kun Lan · Heaven Smile · Gatekeeper · Kenjiro Matsuoka
Angel Angel · Red Gunners · Bianca · Pussy
Sunset Toru Fukushima · Young Guys ×3 · Jean DePaul · Julia Kisugi · Spencer · Hiroyasu Kurahashi · Shinya Akiba · Hiro Kasai · Mary · Plenty
Cloudman Andrei Ulmeyda · Stacy Spangles · Cult Member · Old Man · Man in Photograph · Drug Store Employee · Postman · Security Guard · Gabriel Clemence · General Lynch · Helga
Encounter Curtis Blackburn · Curtis's Bitch · AYAME Blackburn · Pedro Montana · Mary Montana · Archangel · Xenia
Alter Ego The Handsome Men · Steve Thunderson · Trevor Pearlharbor · Singer · Mithra · LOVE Wilcox
Smile Linda Vermillion · Edo Macalister · Dimitri Nightmare · Holbert · Emir Parkreiner · Benjamin Keane · Greg Nightmare · Solitaire
Lion Last Shot Smile
And... Johnny Gagnon
Hand in killer7 Jaco Checkbox · Jim Townsend · Susan · Graham MacAlister · Jack Foley · Mr. A
killer is dead Shigeki Birkin · Samayoru · Mario Castiglioni
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